<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>vue-2</title>
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
    <div id="vae-app">
        <button v-on:click='add'>加一岁</button>
        <button v-on:click='jian'>减一岁</button>
        <h1>my si age :{{ age }}</h1>
    </div>

    <script type="text/javascript" src="app.js"></script>
</body>
</html>